Financial Services Arrangements - Financial Information for Polaris Acceptance Reflecting Effects of Securitization Facility (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Net income	$ 493.9	$ 124.8	$ 324.0
Total Assets	5,047.8	4,632.7
Total Liabilities and Partners' Capital	5,047.8	4,632.7
Polaris Acceptance
Schedule of Investments [Line Items]
Revenues	21.9	44.7	79.3
Interest and operating expenses	6.6	7.6	14.4
Net income	15.3	37.1	$ 64.9
Finance receivables, net	470.7	392.7
Other assets	29.1	13.9
Total Assets	499.8	406.6
Notes Payable	366.9	248.4
Other liabilities	34.4	39.4
Partners' capital	98.5	118.8
Total Liabilities and Partners' Capital	$ 499.8	$ 406.6
Polaris Acceptance | Maximum
Schedule of Investments [Line Items]
Aggregate repurchase obligation	15.00%